Personally I don't notice much at the low end or change in throttle response. I can feel it though when the high end actuator kicks in around the 4,000 rpm range. If you look at any of the dyno charts you can see a dip and then spike in torque. It reminds me of a turbo kicking in. Of course not as dramatic in the power increase. Like someone else said bang for the buck this is a great option.

especially when just buying an intake for $300-700 dollars, might give only a few actual horsepower...i know from experience.